Oral hygiene device



FIG. 1 is a top plan view of an oral hygiene device according to the design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a cross-sectional view taken along line 7-7 as shown in FIG. 1; and,

FIG. 8 is a cross-sectional view taken along line 8-8 as shown in FIG. 3. 

CLAIM The ornamental design for an oral hygiene device, as shown. 